New typed high temperature acidified corrosion inhibitor and preparation method

Abstract

A corrosion retardant for high-temp acidifying is the homopolymer of N-allyl- quinoline chloride. Its preparing process includes such steps as reaction between chloropropene and quinoline to obtain N-allyl-quinoline chloride, washing it with petroether for removing residual chlorpropene, and homopolymerizing reaction under action of trigger. Its advantage is high filming power on metal surface.

Description

Technical field: [0001] The invention relates to an oilfield chemical agent, especially a high-temperature acidification corrosion inhibitor and a preparation method thereof. Background technique: [0002] Acidizing is one of the important measures to increase oil production. [0003] During the acidizing process, metal equipment and downhole tubing strings in contact with acid fluid may be corroded due to electrochemical reactions. The higher the acid concentration and formation temperature, the more serious the corrosion. In order to prevent or reduce the corrosion inhibition of acid liquid on equipment and downhole tubing strings, corrosion inhibitors can be used. Commonly used corrosion inhibitor components mainly include three categories: one is acetylenic alcohols, such as propynyl alcohol, butynyl alcohol, pentynyl alcohol, etc. The triple bond of these acetylenic alcohols is at the 1 position of the carbon chain, and the hydroxyl group is at the carbon chain. 3-po...

AI Technical Summary

Problems solved by technology

However, this type of corrosion inhibitor has the following defects: (1) The cost of pyridine, quinoline, and benzoquinoline used to synthesize quaternary ammonium salts is relatively high, which limits the domestic application of this type of corrosion inhibitor

In order to reduce costs, Huazhong University of Science and Technology once used pyridine still residues as raw materials to synthesize 7701 corrosion inhibitors, but the sources of such raw materials are limited

(2) Although the quaternary ammonium salt has high thermal stability, the desorption phenomenon is serious during high temperature corrosion inhibition, so a higher concentration is required

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